The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Hasselblad XCD 45mm F3.5 and the Sigma 50mm F1.4 DG HSM A for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sigma 50mm F1.4 DG HSM A is the longer of the two lenses at 100mm. The Hasselblad XCD 45mm F3.5 with a length of 75mm, is 25mm shorter. Besides being longer, the Sigma 50mm F1.4 DG HSM A also has a larger diameter of 85mm compared to the Hasselblad XCD 45mm F3.5's 77mm diameter.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Hasselblad XCD 45mm F3.5 weighs 475g, which means it is 340g (41%) lighter than the Sigma 50mm F1.4 DG HSM A which has a weight of 815g.
Lens Mounts
The Hasselblad XCD 45mm F3.5 has the Hasselblad X lens mount whereas the Sigma 50mm F1.4 DG HSM A has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are Hasselblad X2D, Hasselblad X1D II 50C and Hasselblad X1D for the Hasselblad X Mount and Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount.
Sigma 50mm F1.4 DG HSM A is also available in Canon EF , Sony Alpha, Nikon F (FX) and Leica L mounts.
Focal Range
Hasselblad XCD 45mm F3.5 is a prime lens with fixed focal lenght of 45mm. Sigma 50mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 50mm.